<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon
                :closable="false">
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex-0"
                finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
                label-width="100px" label-position="top">
                <!-- tab栏区域 -->
                <el-tabs v-model="activeIndex" :tab-position="'left'"
                    :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price"
                                type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"
                                type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number"
                                type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader v-model="addForm.goods_cat"
                                :options="catelist" :props="cateProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name"
                            v-for="item in manyTableData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb"
                                    v-for="(cb,i) in item.attr_vals" :key="i"
                                    border>
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name"
                            v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove" list-type="picture"
                            :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传
                            </el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">
                            添加商品
                        </el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品详情描述
                goods_introduce: '',
                attrs: []
            },
            // 验证规则
            addFormRules: {
                goods_name: [
                    {
                        required: true,
                        message: '请输入商品名称',
                        trigger: 'blur'
                    }
                ],
                goods_price: [
                    {
                        required: true,
                        message: '请输入商品价格',
                        trigger: 'blur'
                    }
                ],
                goods_weight: [
                    {
                        required: true,
                        message: '请输入商品重量',
                        trigger: 'blur'
                    }
                ],
                goods_number: [
                    {
                        required: true,
                        message: '请输入商品数量',
                        trigger: 'blur'
                    }
                ],
                goods_cat: [
                    {
                        required: true,
                        message: '请选择商品分类',
                        trigger: 'blur'
                    }
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 动态参数列表
            manyTableData: [],
            // 静态属性列表
            onlyTableData: [],
            uploadURL: 'http://8.131.62.137:1016/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据失败')
            }

            this.catelist = res.data
            console.log(res.data)
        },
        // 级联选择器选中项变化，触发函数
        handleChange() {
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName, oldActiveName) {
            if (oldActiveName !== 0 && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        async tabClicked() {
            if (this.activeIndex === '1') {
                // 证明访问的是动态参数面板
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    {
                        params: {
                            sel: 'many'
                        }
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态列表失败')
                }
                res.data.forEach(item => {
                    item.attr_vals =
                        item.attr_vals.length === 0
                            ? []
                            : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    {
                        params: {
                            sel: 'only'
                        }
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取静态属性失败')
                }
                this.onlyTableData = res.data
                console.log(res.data)
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // 1.获取将要删除的图片临时路径
            const filePath = file.response.data.tmp_path
            // 2.从 pics 数组中，找到图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pics === filePath)
            // 3. splice方法 从数组中移除
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response)
            // 拼接图片信息对象
            const picInfo = { pics: response.data.tmp_path }
            // 将图片push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // 添加商品
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项')
                }
                // 执行添加业务逻辑
                // lodash cloneDeep 对象深拷贝
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态参数
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs

                // 发起请求添加商品  商品的名称必须是唯一的
                const { data: res } = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！')
                }

                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang='less' scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}
.previewImg {
    width: 100%;
}
.btnAdd {
    margin-top: 15px;
}
</style>
